Cr5 series back-up roll was remelted by fiber laser in this study. Through the analysis of structure

micro-hardness and wear resistance

the influence of laser power and scanning speed on single-pass remelted layer

as well as the influence of laser power and scanning distance on multi-pass remelted layer were studied. The result indicates that laser remelting can improve the surface performance greatly

the microhardness reaches 800 HV for single pass processing. The remelted layer has been softened by the later laser pass in the multi-passes processing. But it has good thermal stability

the average microhardness can reach about 600～700 HV

the wear resistance increases about 10 times after the fiber laser remelted. Under this condition of experiment

when the laser power is 1.4 k W

scanning speeding is 0.48 mm/min

scanning interval is 2.2 mm

it has a relatively good production efficiency and wear-resisting performance.